66 CAUDAL VERTEBRAE. [chap. 



the coccyx, or os coccygis, of anthropotomy. The first is some- 

 times ankylosed to the sacrum. 



Among the Simiina there are but 4 to 5 caudal vertebn 

 in the Anthropoid Apes and in the Barbary and Blacl 

 Macaques, no more than 10 in some Baboons, and as man) 

 as 32 in Semnopithecus, and 2>Z m some of the Spider M01 

 keys (A teles). 



In the latter the tail is prehensile, and the vertebras are 

 broader and altogether more strongly developed than in the 

 weak, pendant, though almost equally long tails of the Old 

 World monkeys. 



Chevron bones are found in all except those species that 

 have the tails quite rudimentary. They are most fully de- 

 veloped in Ateles, where the extremities are often bifurcated. 

 They are attached to a pair of projections on the anterior 

 end of the lower surface of the vertebra. 



In the Lemurina, the number of the caudal vertebras 

 varies from 5 to 29. 



Among the Carnivora, the Bears have very short tails, 

 with from 8 to 1 o vertebras, the Seals from 9 to 14; some 

 of the Lynxes have but 13, but most of the animals of the 

 order have tails of moderate or great length ; the greatest 

 number of vertebras being found in Paradoxurus, which 

 may have as many as ^6. 



Chevron bones are usually not much developed; they 

 are articulated (sometimes ankylosed) to the front ends of 

 the vertebras, as in the Primates. 



In the Insectivora, the tail is very variable. It is short 

 and simple in Erinaceus and Centetes, long in Soletwdon, 

 Gymmira, Potamogale, Tupaia and Phynchocyon ; in the 

 last-named genus the chevron bones are well developed and 

 bifid. 



In the Chiroptera, the tail is sometimes exceedingly 



